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Calculations of neutron spectra after neutron-neutron scattering

Publication ,  Journal Article
Crawford, BE; Stephenson, SL; Howell, CR; Mitchell, GE; Tornow, W; Furman, WI; Lychagin, EV; Muzichka, AY; Nekhaev, GV; Strelkov, AV ...
Published in: Journal of Physics G: Nuclear and Particle Physics
September 1, 2004

A direct neutron-neutron scattering length, ann, measurement with the goal of 3% accuracy (0.5 fm) is under preparation at the aperiodic pulsed reactor YAGUAR. A direct measurement of ann will not only help resolve conflicting results of ann by indirect means, but also in comparison to the proton-proton scattering length, app, shed light on the charge-symmetry of the nuclear force. We discuss in detail the analysis of the nn-scattering data in terms of a simple analytical expression. We also discuss calibration measurements using the time-of-flight spectra of neutrons scattered on He and Ar gases and the neutron activation technique. In particular, we calculate the neutron velocity and time-of-flight spectra after scattering neutrons on neutrons and after scattering neutrons on He and Ar atoms for the proposed experimental geometry, using a realistic neutron flux spectrum - Maxwellian plus epithermal tail. The shape of the neutron spectrum after scattering is appreciably different from the initial spectrum, due to collisions between thermal-thermal and thermal-epithermal neutrons. At the same time, the integral over the Maxwellian part of the realistic scattering spectrum differs by only about 6 per cent from that of a pure Maxwellian nn-scattering spectrum.

Duke Scholars

Published In

Journal of Physics G: Nuclear and Particle Physics

DOI

ISSN

0954-3899

Publication Date

September 1, 2004

Volume

30

Issue

9

Start / End Page

1269 / 1285

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

Citation

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Crawford, B. E., Stephenson, S. L., Howell, C. R., Mitchell, G. E., Tornow, W., Furman, W. I., … Shvetsov, V. N. (2004). Calculations of neutron spectra after neutron-neutron scattering. Journal of Physics G: Nuclear and Particle Physics, 30(9), 1269–1285. https://doi.org/10.1088/0954-3899/30/9/024
Crawford, B. E., S. L. Stephenson, C. R. Howell, G. E. Mitchell, W. Tornow, W. I. Furman, E. V. Lychagin, et al. “Calculations of neutron spectra after neutron-neutron scattering.” Journal of Physics G: Nuclear and Particle Physics 30, no. 9 (September 1, 2004): 1269–85. https://doi.org/10.1088/0954-3899/30/9/024.
Crawford BE, Stephenson SL, Howell CR, Mitchell GE, Tornow W, Furman WI, et al. Calculations of neutron spectra after neutron-neutron scattering. Journal of Physics G: Nuclear and Particle Physics. 2004 Sep 1;30(9):1269–85.
Crawford, B. E., et al. “Calculations of neutron spectra after neutron-neutron scattering.” Journal of Physics G: Nuclear and Particle Physics, vol. 30, no. 9, Sept. 2004, pp. 1269–85. Scopus, doi:10.1088/0954-3899/30/9/024.
Crawford BE, Stephenson SL, Howell CR, Mitchell GE, Tornow W, Furman WI, Lychagin EV, Muzichka AY, Nekhaev GV, Strelkov AV, Sharapov EI, Shvetsov VN. Calculations of neutron spectra after neutron-neutron scattering. Journal of Physics G: Nuclear and Particle Physics. 2004 Sep 1;30(9):1269–1285.
Journal cover image

Published In

Journal of Physics G: Nuclear and Particle Physics

DOI

ISSN

0954-3899

Publication Date

September 1, 2004

Volume

30

Issue

9

Start / End Page

1269 / 1285

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics